FastAPI: Validating Models with Pydantic's Field
Pydantic's `Field` adds guardrails directly to your data model's attributes. Use it to enforce constraints like string length (`max_length=50`) or numeric ranges (`gt=0`), making your models self-validating.
Pydantic's `Field` attaches validation rules directly to your data model's attributes, turning a simple class into a self-validating data contract. It's essential for request bodies, letting you enforce string length, numeric ranges (`gt=0`), and add metadata for API docs. The common mistake is confusing `Field` (for model attributes) with `Query` or `Path` (for function parameters); they provide similar validation but apply at different levels of your API.
Read the original → fastapi.tiangolo.com
- #fastapi
- #pydantic
- #validation
- #python
- #api
Get five bites like this every day.
Tezvyn delivers a daily feed of 60-second tech bites with quizzes to lock in what you learn.